Taper-roughing tool.



B. M. W. HANSON.

TAPEB. ROUGHING TOOL.

APPLIOATION FILED MAiL.9,1908.

Patented Nov. 2, 1909.

fin/en tar: "(Hanson fly lueAttorn eys- UNITED STATES PATENT BENG'I. M. W. HANSON, 0F HARTFORD, COIl'NBCTICUT, ASSIGNOB TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

ram-nonnative 'roon.

Specification of 1m Patent.

Patented Nov. 2, 1909.

lb all whom it my camera:

Be it known that I Bmvc'r M. W. Hanson, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Im rovements 1n Taper- Roughing Tools, of w ich the following is a specification.

This invention relates to taper roughing tools, the obect of the invention hel to provide an e ect-ive implement of this c a racter capable of covering a greater area 1n its action than certain forms of such devices with which I am familiar and which is primarily intended to rough out taper holes prior to their being dressed down by a reamen- In the drawings accompanyin and forming a part of this cification, I ve shown in detail one simp e form of embodiment of the invention which to enable those skilled in the art to ractice the same, will set forth in detail in the following descri tion while the novelty of the invention w be included in the claims succeeding said description.

Referring to said drawings, Figure 1 is a side elevation of a taper roughing tool involving my invention. Fig. 2 is an elevation from one end of the tool. Fig. 3 is an elevation from the op osite end of the same. Figs. 4, 5 and 6 are is mmatic views in sectional side elevation owing the character of work performed by the implement. Figs. 7, 8 and 9 are cross sectional elevations, and are like the three preceding figures on an an rated scale, and, Fig. 10 is a lo 'tudina section of the work.

Like 0 aracters refer to like parts throughout the several figurm.

My invention may be incorporated with advanta e in taper roughing tools of various styles; 5113 too shown in the drawi is denoted in a general way by 2 and is of the fluted type. I have shown as connected with said tool a stop-sleeve as 3, whlch in practice is slipped over the same and is united separably therewith in any suitable manner, for instance by a key or pin as 4 passing through registering perorations in the s cave and too respectively. The forward end of this sleeve by abutting against the work revents the tool entering too far into a ho e therein. The use of a sleeve, however, in conjunction with the implement is not a matter of an consequence as the invention does not. real e therein but in the tool.

The tool 2 is shown as havin flutes 5 b which there are forme several lands 6. here may be any desirable number of flutes and lands, three of each being illustrated.

. In one of its general aspects a to tool involving my invent-ion as long:- tu mally extending rows of teeth, the teeth of the rows being 111 staggered relation with respectto each other. y virtue of this relation I attain an important function in that as the tool is rotated the teeth of the several rows cover wide areas, much wider in fact than if they were laterally alined or in transverse coincidence. I may secure the staggered relation of the cuttin teeth in many ways'but find a simple m e of doing so by spirally disposing said teeth by reason of which the teeth of one row are situated alteruatel with respect to, or overlap the teeth of t e adjacent row or rows, assuming that as shown there are three rows.

The 31ml disposition of the teeth may be obtain for illustration by spiral] grooving the lands 6 as at 7, the ve el interm ted by the flutes. ach land erefore s several transverse notches across the same and at an oblique disposition to the ion 'tudinal axis of the tool. The ving of e lands in the present case ma as three longitudinally extendi rows of teeth which for convenience w be designated respectivel by 8, 9 and 10. An advantage follows e formation of as iral groove as described in that the severe cutt-mg teeth have their operative or working portions at an acute angle which effectively act upon th! stock or work; this also provides for am is clearance.

twill be assumed that the cutting tooth in Figs. 4 and 7 is one of the teeth 8, that the tooth shown in Figs. 5 and 8 is one of the teeth 9, and finally that the tooth shown in Figs. 6 and 9 is one of the teeth 10.

In use the tool is mounted in the customary manner and is therefore advanced in the direction of its length and simultaneously rotated to enter and also turn in a previously-made hole in the work or stock 11. As the tool turns in contact with the wall of such hole, the teeth 8, 9 and 10 which collectively present a transversely several r rough- Bio disposed row do not follow a path at right angles to the longitudinal axis of the tool but their trend is in a direction oblique to such axis, the consequence being that while all three teeth are concurrently acting upon the wall of the hole they are operatin upon surfaces which are laterally separa relative to the length of the tool, and the result of this is that the field covered by the tool is very much greater than where the teeth are in register in a direction at right angles to the longitudinal axis of the tool. I might state that in describingthe action of one tooth of each row particularly in connection with the enlarged diagrammatic views Figs. 4 to 9 inclusive, this onl represents in part the com letc action of t 1e tool. The operation re erred to in detail is repeated with all the teeth of the tool. I wish to make it clear that each tooth follows its individual track and not the track of another tooth whereby I attain the new result hereinbefore set forth.

In Fig. 10 I have shown a hole after it has been cut b the tool; the latter leaves on the wall of t e hole several shallow ridges which can be quickly and easily removed with an ordinary reamer.

M taper rou hing tool as will be evident has ongltudina rows of teeth the teeth of each now being out of circumferential line with the teeth of the adjacent row. Each of said teeth has a front end clearance or relief portion as shown in F' 1 and also clearance or relief portions on re outer surface thereof one of which extends longitudinally of the tool and the other laterally of said tool. Said longitudinal clearance or relief portion is usually made by forming the teeth upon a back taper as illustrated in Figs. 4, 5 and 6. The lateral clearance portions of said teeth are best illustrated in the dia ammatic Figs. 7, 8 and 9. a

ith a tool of the kind noted I can initially ream out a hole almost frictionlessly and in a. greatly less time than is possible with the ordinary tool.

In practice the tool will be given a taper sullicient to meet the conditions under which it IS operated.

It will be apparent from what has heretofore been stated that I have described one advantageous embodiment of an invention; many variations may be made 111 the disclosure of the present, description and drawinfi, within the sec of my claims.

av ng describe the invention, what I claim is:

1. A taper r0 hin tool ha lo tudinally disp rox s of teeth lie 5 11 of each row being out of circumferential line with the teeth of the adjacent row and each tooth havingafront end clearance portion and also having clearance ortions on the outer surface thereof longitu ally and laterally of the tool.

2. A taper roughing tool having lands and also aving a spiral groove intersect- 1135 said lands to form thereon teeth prov1 ed with front end clearance portions and each tooth being upon a back taper and also inclined lateral y on the outer surface thereof to present two additional clearance por tious.

In testimony whereof I aflix my signature in presence of two witnesses.

' BENGT M. W. HANSON.

W'itnesses:

W. M. S'mnns, Evsus'rr E. Anxow. 

